Java day7

目录：类与构造

package JavaSE;
/*
    学生类
 */
public class Student {
    /*private String name;
    private int age;
    //构建方法
    *//*public Student(){
        System.out.println("无参构造方法");
    }*//*

    public Student(){}
    public Student(String name){
        this.name=name;
    }

    public Student(int age){
        this.age=age;
    }

    public Student(String name,int age){
        this.name=name;
        this.age=age;
    }
    public void show(){
        System.out.println(name+","+age);
    }*/
    //成员变量
   /* String name;
    private int age;


    //提供get/set方法
    public void setAge(int a){
//        age=a;
        if(a<0||a>120)
            System.out.println("你给的年龄有误");
        else
            age=a;
    }
    public int getAge(){
        return age;
    }
    public void show()
    {
        System.out.println(name+","+age);
    }*/
    //成员方法
    /*public void study()
    {
        System.out.println("好好学习，天天向上");
    }
    public void doHomework()
    {
        System.out.println("键盘敲烂，月薪过万");
    }*/
    //成员变量
    private String name;
    private int age;

    //构造方法
    public Student(){}

    public Student(String name,int age){
        this.name=name;
        this.age=age;
    }

    //成员方法
    public void setName(String name){
        this.name=name;
    }
    public String getName(){
        return name;
    }

    public void setAge(int age){
        this.age=age;
    }
    public int getAge(){
        return age;
    }
    public void show(){
        System.out.println(name+","+age);
    }
}

           

package JavaSE;
/*
    学生测试类
 */
public class StudentDemo {
    public static void main(String[] args) {
        Student s1=new Student();
        s1.setName("林青霞");
        s1.setAge(30);
        s1.show();

        Student s2=new Student("林青霞",30);
        s2.show();

        /*Student s3=new Student(30);
        s3.show();

        Student s4=new Student("林青霞",30);
         s4.show();*/
  /*      //创建对象
        Student s1=new Student();
//        System.out.println(s);
        //使用对象
        //System.out.println(s1.name+","+s1.age);

        s1.name="林青霞";
        s1.age=30;

        System.out.println(s1.name+","+s1.age);

//        s1.study();
//        s1.doHomework();
        Student s2=s1;
//        System.out.println(s);
        //使用对象
        //System.out.println(s2.name+","+s2.age);

        s2.name="江姐";
        s2.age=28;

        //System.out.println(s2.name+","+s2.age);
        System.out.println(s2.name+","+s2.age);
        System.out.println(s1.name+","+s1.age);*/
//        s2.study();
//        s2.doHomework();
        //创建对象

 /*       itheima s=new itheima();

        s.setName("林青霞");
        s.setAge(30);

        s.show();*/

        //使用get方法获取成员变量的值
        //System.out.println(s.getName()+"---"+s.getAge());
    }
}

           

package JavaSE;
/*
    学生类
 */
public class itheima {
   /* //成员变量
    private String name;
    private int age;

    //get/set方法
    public void setName(String name){
        //name=name;
        this.name=name;

    }
    public String getName(){
        return name;
    }
   *//* public void setAge(int n){
        age=n;
    }*//*

    public void setAge(int age){
        this.age=age;
    }

    public int getAge(){
        return age;
    }

    public void show(){
        System.out.println(name+","+age);
    }*/

    //成员变量
   /* private String name;
    private String age;

    //构造方法
    //public Student(){}

    public Student(String name){
        this.name=name;
        this.age=age;
    }

    //成员方法
    public void setName(String name){
        this.name=name;
    }
    public String getName(){
        return name;
    }

    public void setAge(String age){
        this.age=age;
    }
    public String getAge(){
        return age;
    }
    public void show(){
        System.out.println(name+","+age);
    }*/
}